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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Measuring Seafloor Displacement Using Repeated Sidescan Sonar Surveys

DeSanto, John B. 03 January 2019 (has links)
<p> The purpose of this thesis is to propose and develop a novel tool for measuring seafloor displacement using repeated sidescan sonar surveys, a data set that is collected alongside multibeam bathymetry. Chapter 1 presents the motivation for this study and introduces the work done in subsequent chapters. Chapter 2 is a brief overview of the design and underlying physics of the multibeam sonar, and presents a discussion on the uncertainties introduced by errors in the sound velocity profile. Chapter 3 presents the processing method for measuring seafloor displacement from sidescan sonar in detail, and tests this method by measuring synthetic displacements introduced into legacy multibeam data. Chapter 4 presents data collected in calibration surveys during the RR1605 and SR1704 cruises meant to test this method. We find displacements measurements with RMS uncertainties less than 0.5 m under optimal survey designs involving speeds less than 6 knots, kinematic post-processed ship navigation, and frequent measurements of the sound velocity profile. Chapter 5 demonstrates the improvement in ship positioning obtained when performing kinematic post-processing on the raw ship navigation data rather than relying on the real-time navigation solution.</p><p>

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